Polarization Reconfigurable Circular Patch MIMO Antenna with Improved Isolation

Abstract:

The present work represents polarization reconfigurable MIMO antenna which is design to work at 2.4 GHz (WLAN) and C band application. An inverted U-shaped slot and two PIN diodes per radiator are incorporated in the circular patch antenna to achieve polarization reconfigurability between Linear and Circular polarization (RHCP or LHCP). A simple rectangular strip is utilized between the radiators to achieve isolation improvement from -14 dB to -22dB in the proposed design. Computer Simulation Technology (CST) 2018 is used to design and validate the polarization reconfigurable MIMO antenna with sufficient isolation. Surface current distribution, Envelope Correlation Coefficient (ECC) and Diversity Gain (DG) and axial ratio are calculated using simulation software and used to validate circularly polarized MIMO design’s diverse behavior. The design is fabricated in low-cost FR-4 material and measurement is done to verify the simulation results. The measurement results show close agreement with simulated results and proves that the proposed design can be a better candidate for WLAN and C band application with polarization reconfiguration properties.

• Periodical: Advanced Engineering Forum (Volume 56)
• Pages: 73-84
• DOI: https://doi.org/10.4028/p-k5vDXi
• Online since: June 2025
• Authors: Sumit Kumar Gupta*, Ullas Kumar Agrawal, Soma Das
• Keywords: Circular, Isolation, MIMO, Polarization, Reconfigurable

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